4 kg moles of an ideal gas expands in vacuum spontaneously. The work done is_________________?
Correct answer: C. 0
- A. 4 J
- B. ∞
- C. 0
- D. 8 J
Explanation
During free expansion into a vacuum, there is no opposing external pressure, so boundary work W = bf PfdV is zero. This remains true even though the gas expands spontaneously.
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